Electric Field Patterning for OLED Substrates
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Solution Overview
Problem
Current methods for patterning substrates in organic light-emitting devices face challenges in achieving precise and efficient deposition of patterning solutions, leading to suboptimal mask effects and patterning quality, particularly in creating full-color images where red, green, and blue sub-pixels require accurate patterning.
Innovation Solution
A method involving a spray nozzle and a voltage driving unit that applies specific potentials to the nozzle and cell electrodes, along with a back electrode, to create controlled electric fields for selective deposition of patterning solutions on substrates, ensuring the parameters satisfy certain inequations to enhance the mask effect and patterning precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional masking methods are used for patterning substrates, then the patterning process is simple, but the mask effect and patterning precision are insufficient
Solution Approach 1:
The patent replaces the conventional mechanical masking system with an electric field-based control system. Instead of using physical masks to define patterns, the invention applies different potentials to cell electrodes to create electric fields that selectively guide charged patterning solution droplets to desired locations. This substitution of mechanical masking with electrical field control achieves superior patterning precision while eliminating mask-related limitations.
Solution Approach 2:
The invention utilizes parameter changes by varying the electric potential applied to different cell electrodes. By adjusting the potential values (e.g., ground potential for first cell electrodes, different potential for second cell electrodes), the system dynamically controls the electric field distribution to achieve selective deposition. This parameter-based control enables precise patterning without requiring complex mechanical mask structures.
2Manufacturing precision
If physical masks are used for defining sub-pixel patterns, then the process is straightforward, but the mask effect is insufficient leading to poor patterning quality
Solution Approach 1:
The patent replaces physical masks with an electrical field-based patterning system. Charged droplets of patterning solution are guided by electric fields created between the spray nozzle and cell electrodes with different potentials. This eliminates the need for physical masks while achieving superior mask effect and patterning quality, as the electric fields can be precisely controlled and adjusted without mechanical limitations.
Solution Approach 2:
The invention introduces charged patterning solution droplets as an intermediary between the spray nozzle and the substrate. These charged droplets respond to electric fields, allowing indirect control of deposition patterns through potential differences applied to cell electrodes. This intermediary approach enables precise patterning without direct mechanical contact or physical masks.
3Productivity
If conventional spray deposition is used without electric field control, then the process is simple, but the selective deposition capability and patterning efficiency are poor
Solution Approach 1:
The patent replaces conventional mechanical spray deposition with an electric field-controlled spray system. By applying different potentials to the spray nozzle and cell electrodes, the system electrostatically guides charged droplets to specific locations. This substitution dramatically improves patterning efficiency and selective deposition capability, as droplets are actively directed rather than passively deposited, reducing waste and improving precision.
Solution Approach 2:
The invention utilizes parameter changes by adjusting the electric potential values applied to different components. The spray nozzle is maintained at a fixed potential while cell electrodes are assigned different potentials (ground or alternative potentials) based on the desired pattern. This dynamic parameter adjustment enables selective deposition and高效 patterning, with the ability to quickly reconfigure patterns by changing potential assignments without mechanical repositioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the mask effect and patterning quality by selectively depositing patterning solutions on predetermined areas, enabling the creation of high-quality full-color images in organic light-emitting devices with enhanced precision and efficiency.
Implementation Method 1
applying a first potential to a spray nozzle, applying a second potential to at least one first cell electrode among a plurality of cell electrodes on a first surface of the substrate, applying a third potential to at least one second cell electrode excluding the at least one first cell electrode among the plurality of cell electrodes, applying a fourth potential to a second surface that is opposite to the first surface of the substrate, and selectively depositing the patterning solution on the at least one first cell electrode by spraying the patterning solution from the spray nozzle
Data Source
AI summary
A method of patterning a substrate includes applying a first potential to a spray nozzle, applying a second potential to at least one first cell electrode among a plurality of cell electrodes on a first surface of the substrate, applying a third potential to at least one second cell electrode excluding the at least one first cell electrode among the cell electrodes, and applying a fourth potential to a second surface that is opposite to the first surface of the substrate.